peiler



Oct. 19, 1926. 1,603,979

K. E. Pl-:lLl-:R

lPL'UNGER STOF FOR GLASS PRESSE S Filed Dc. 21-l 1920 mum muur-m: ullllnlll Patented @et 19, 1926.

KARL E. PEILER, OF VIEST HARTFORD, CONNECTICUT, ASSIGNOR T HARTFORD-EM- PIRE COMPANY, OF HARTFORD, CONNECTICUT, A CORFORA'ITON OF DELAWARE.

IPLUNGER STOP FOR GLASS PRESSES.

Application filed December 21, 1920.

This invention relates to improvements inY glass shaping machines, and'is designed particularly for use in connection with 'any machine which performs a pressing operation.

sential to the present invention beingomitted from the accompanying drawings, in which Figure 1 is a front elevation of a machine embodying this improvement, with parts broken away.

Figs. 2 and 3 are detail views on an en- 'larged scale of the plunger stop mecha` "characters nisin disclosed at the left of Fig. 1. Fig. 2 showing the stop in operating position, and Fig. 3 showing it in non-operating position.

The machine' shown herein has right-hand and left-hand pressing mechanisms. both supported by the saine framework and actuated f by the same operating mechanism. Corresponding parts of the similar mechanisms are indicated by similar reference As this supporting structure forms nol part of the present invention, it will only be described briefly.

Two cylinders 10, having piston rods 11, carrying plungers 12, are mounted on a tie 13 secured to a pair of supporting columns 14, mounted on bed 15.

To hold down the plunger rings, which closev the mold top during the pressing operation and to disengage ythe pressed glass from a plunger after each pressing operation, a stripper plate mechanism is secured to the lower portion of each piston rod, and comprises stripper spring plate 16 secured directly to thepiston rod and carrying bolts 17 fastened at their lowerI ends in stripper Serial No. 432.260.

plates 18 that surround the plungers 12. Stripper springs 20. carried on bolts 17. press the stripper plate downwardly until stopped by the bolt heads seating on the spring plate 16. During pressing the springs hoid the plunger ringagainst tie mold top to close the latter. v

The pistons are controlled by slide valves 21 operated by valve rods V22 through valve levers 23, pivoted in brackets on tie 13 and working against springs 17 below the valves. The lower ends of the valve rods are attached to rocker arms 24. secured on rock shafts 25. supported iny suitable brackets on the bed. these shafts being actuated by their cani arms 26 engaging suitable cams 27 on a cam shaft 28,' and driven through bevel gears 30 and 31. The latter is integral with worm wheel 33 and carried with it on stud 32. The worm wheel 33'is driven by a worm on a. power shaftv 35, 'supplied with power from any suitable source.

Mold tables 36 operated by any suitable means in time with the cam shaft 28 are also mounted on the bed 15 and carry any convenient number of molds 37, of which only one is shown on each table.

In the embodiment of the'Y invention shown herein, suitable plunger rings 38 are made separate from but ai'e attached to the stripper plates 18 in accordance with the usual practice, to enable the plunger ring to be removed and other rings substituted for diiferent forms and sizes of ware. However, for the performance of its stripper function, which is mainly involved in the present invention, the plunger ring and stripper plate might be made in a. single integral piece, but in either event in case the stripping mechanism fails to act, because of the adhesion of the pressed or partially pressed glass to the plunger on its rip-stroke, the resultant displacement of the stripper mechanism causes the stopping of the pressing mechanism. This is eHected by providing the stripper mechanism with a projecting portion for contacting with mechanism to be described later. For this purpose, the projecting portion may be a dog 40 secured to the upper ends of the stripper plate bolts 17, as shown herein, or it may be integral with or secured to any other convenient part of the stripper mechanism, as for instance the plunger ring 38 or the stripper plate 18, in which event the parts with which it cooperates would be correspondingly lowered in position.

Attached to a column 4l is a latch bracket 42, provided with openings through which pass valve rods 22, carrying collars 43. To the bracket are pivoted latches 44 ,provided with trip lingers 45 and stop pins 46 to limit downward movement of the trip fingers.

In normal operation, the spring 47 below each slide valve 21 tends to raise the valve and lower the valve rod 22 holding cam arm 26 against cam 27. Lowering the valve rod allows the valve to rise andadmit air above the piston forcing it down and causing plunger 12 to ldescend into the glass in the mold to form an article 48. This also lowers the stripper spring plate 16 until the plun er ring 38 contacts with the mold 37, and t e springs 2O compress,causing the bolts 17 to project above the stripper spring plate 16. Gam 27 then lifts the valve rod, lowering the `slide valve and admitting air below the piston to raise the plunger, whereupon the stripper springs 20 force the stripper plate 18 and plunger ring 38 down, stripping the pressed 4glass 48 off of the plunger and leaving it in the mold. The plunger ring remains Iin contact with the mold and the stripping action continues untilthe heads of the bolts 17 bear against the stripper spring 4plate 16, whereupon it is lifted off and rises Vwith the plunger.

In these operations 4the glass-is liable to adhere to the plunger and be drawn out of the mold With the plunger, due to the contraction of the chilled glass upon it, or the overheating of the plunger. To guard against such withdrawahthe stripper mechanism is employed, but in case the adhesion is too great, the pressure of the stripper springs 20 will be insuiiicient to force the strip plate down and strip the glass olf the plunger. Hence the pressed glass 50 will rise with the plunger, as shown at the left of 1 and in Fig. 2. In such a case the machine should be stopped promptly to facilitate quick removal of the adhering glass to prevent further overheating. and allow the plunger to be cooled, as otherwise the pliniiger lwith its adhering glass will be forced down, into the succeeding mold or molds, each carrying itsadditional charge of glass. This is liable to damage the parts or their actuating mechanism by overstraining them, besides increasing the difficulty of removing the glass from the rapidly overheat-ing plunger. Under such circumstances the stripper mechanism will continue to be displaced relative to the plunger, and the bolts 17 will continue to project above the stripper spring plate 16. Consequently, when `the plunger has risen to the position shown in these figures, dog 40, due to its upward displacement, will rise high enough to strike trip finger 45 and throw latch 44 inwardly against valve rod 22. This brings latch 44 below collar 43, which is now in its upper position, the valve rod 22 having risen to cause the plunger to lift. In this position (Fig. 2) the latch prevents lthe valve rod from lowering, thus preventing modified in various ways to adapt it to other types of presses. For example, in the case of a plunger operated by a crank, by cams, or by an eccentric, the movement of the displaced dog 40 may be adapted to disconnect a `clutch or other driving connection of the plunger actuating means.

. In various other ways within the scope of the appended claims, the invention may be modified to suit different constructions or arrangements ofL machines to which it is applied. i

What is claimed as new is 1. In a glass shaping machine, the combination with glass pressing elements including a mold, of actuating means for moving one of said elements relative to the other to press glass in said mold, and means controlled by abnormal adhesion of glass to said pressing means for discontinuing the operation of said actuating means.

V2. In glass shaping mechanism, the combination with a pressing plunger and its actuating means, and means for stripping the glass from the plunger after each pressing operation, of means actuated by the stripping means, when in abnormal position by failure to complete its stripping function, for arresting further actuation 'of the plunger.

3. In a glass shaping machine, the combination of a plunger. a stripping device there for, a valve controlled means for operating said plunger, and means cooperating with the stripping device and with the valve controlling means for preventing the operation of the plunger when the stripping device fails to perform its stripping function.

4. In a glass shaping machine, the combination with pressing mechanism including a mold and plunger, of a valve-controlled air .cylinder for effecting relative movement of the mold and plunger, and means controlled by the presence of adhering glass on said plunger for preventing the effective operation of said valve.

5. In a glass shaping machine, the combination ot a pressing mechanism including a plunger, an air cylinder for operating same, a valve for admitting air to the cylinder, a connection for operating said valve, and means controlled by the adhesion of glass to said plunger for preventing the motion ot said connection.

6. In a glass shaping machine, the combi-v nation ot a mold, pressing means associated therewith, actuating means for moving one of said elements relative to the other to press glass in said mold, and latch mechanism adapted to be operatedk by said pressing means to render said actuating; means inoperative when glass adheres to said pressing means.

7. In a vsafety device for a glass shaping machine, the combination of a mold, pressing means cooperating therewith, fluid-pressure means for effecting relative movement between said mold and said pressing means, valve mechanism for controlling the operation of said fluid pressure means, and latch mechanism adapted to be actuated by said pressing means to discontinue the operation of said valve mechanism when glass adheres to said pressing means.

8. In a glass shaping machine, the combination of aV plunger', a plunger ring, a' dog appurtenant to the plunger ring, a latch bracket, a latch mounted thereon, a valve operating rod having a collar mounted thereon` and means tor causing` said dog to move said latch into a position which will prevent the descent oit' the valve operating rod in case the pressed glass adheres to the plunger.

9. In a glass shaping machine, the combination of a plunger, a plunger ring, means for actuating` said members, and means controlled by the position of the plunger ring for arresting tui-ther operation ot the plunger when the plunger ring is in abnormal position after a pressing operation.

10. In a glass shaping machine, the combination of a plunger, a'plunger ring, means for actuatingsaid members, and means, in-

` cluding a latch, operable upon abnormal position ot the plunger ring after a shaping` operation to varrest the operation of the said actuating means.

11. In a glass shaping` machine, the combination oi a pressing` plunger, a plunger ring arranged to be displacedrelative to the plunger by a pressing` operation, and means for arresting further operation ot the plunger when the plunger ring` remains in displaced position relative to the plunger after the pressing operation.

12. In a glass shaping machine, the combination ot a plunger, a plunger ring arranged to be displaced relative to the plunger by a pressing operation, means for restoring these parts to their former positions in the normal operation of the machine, and means for arresting further operation of the plunger in case the plunger ring remains disn placed relative to the plunger after the pressing operation.

13. In a glass shaping machine including two pressing members and means for relatively moving said members periodically to press glass therebetween, the combination of means tor detecting the abnormal presence ot glass on one of said members during the non-pressing1 period, and means rendered operative by such detecting means for stopping the said relative movement.

14. In a glass shaping machine having a pressing plunger, the combination of a member movable relative to the plunger, means for periodically moving the member relative to the plunger, and means rendered operative by the interruption of said relative movement of the member, for stopping the pressing operation ot the plunger.

15. In a glass shaping machine, the combination with al plunger and a cooperating mold, ot a pressure actuated piston and cylinder arranged to cause the plunger and mold to press glass therebetween, means for detecting the presence of glass on the plunger w ien in non-pressing position, and connections between the detecting means and the pressure supply of the cylinder operative to prevent admission of actuating pressure to the cylinder.

16. In a pressing mechanism or the like, forming members, means to operate the forming members to mold plastic material between said forming members, and a detecting device operable to render said means inoperative when the molded material sticks to a certain one of the forming members.v

17. In a pressing mechanism or the like, tormingmembers, a rotatable table carrying certain of said members, means to operate the forming members to mold plastic material between said forming members, and a detecting device operable to render said means inoperative when the molded material abnormally adheres to one ot the forming members, without stopping the rotation ot said table.

18. In a pressing mechanism or the like,

forming members, a rotatable table carrying.

at least one of said members, means includ-i ing a pneumatic ram to operate the forming members toy mold plastic material between said forming members, and a detecting device actuated between moldinp operations and operable to render said ram inoperative when the molded material abnormally adheres to one of the forming members, without stopping the rotation of said table.

19. In a pressing mechanism or the like, forming members, means comprising a pneubetween said forming members, and a del0 tecting device actuated between molding operations and operable to render said means inoperative when the molded material sticks to a certain one of the forming members.

Signed at Hartford, Conn., this 17th day 15 of December 1920.

KARL E, PEILER. 

